Fast Load Transient Response System for Voltage Regulators

摘要

A circuit and a method for improving the performance of voltage regulators subject to load transients is presented. An auxiliary circuit generates an auxiliary current at an output of a voltage regulator. The auxiliary circuit comprises transient detection means to detect a load transient at the output of the voltage regulator. The auxiliary circuit comprises an auxiliary impedance to be coupled at one end to the output of the voltage regulator, and an auxiliary switch to modify a voltage level at the other end of the auxiliary impedance by closing or opening the auxiliary switch. The auxiliary circuit comprises a control unit to control the auxiliary switch, subject to the detection of a load transient at the output of the voltage regulator, to modify the voltage level at the other end of the auxiliary impedance.

主权项

1. An auxiliary circuit configured to generate an auxiliary current at an output of a voltage regulator, the auxiliary circuit comprising
transient detection means configured to detect a load transient at the output of the voltage regulator; an auxiliary impedance configured to be coupled at one end to the output of the voltage regulator; an auxiliary switch configured to modify a voltage level at the other end of the auxiliary impedance by closing or opening the auxiliary switch; and a control unit configured to control the auxiliary switch, subject to the detection of a load transient at the output of the voltage regulator, to modify the voltage level at the other end of the auxiliary impedance such that an auxiliary current is flowing through the auxiliary impedance, when the one end of the auxiliary impedance is coupled to the output of the voltage regulator.